Home
Class 12
BIOLOGY
Choose the correct options. a. Thread...

Choose the correct options.
a. Thread-like cytoplasmic strands, running from one cell to other are known as plasmodesmata
b. Xylem and phloem constitute the vascular bundle or the stem.
c. First formed, xylem elements are described as metaxylem.
d. Radial bundles are mainly found in leaves.

A

II is true, but I, Ill and IV are false

B

lll is true, but I, II and IV are false

C

IV is true, but I, ll and lll are false

D

I and II are true, but Ill and IV are false

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Similar Questions

Explore conceptually related problems

Consider the following statement and choose the correct option (i) The thread like cytoplasmic strands, running from one cell to other is known as plasmodesmata (ii) Xylem and phloem constitute the vascular bundle of the stem (iii)The first form xylem elements are described as metaxylem (iv) Radial vascular bundles are mainly found in the leaves

There is no result of 'Girdling Experiment ' in monocot plant is due to :- (a) Presence of wax layer on the surface of its stem (b) Stem is comparatively thin (c) Phloem is inside xylem (d) Vascular bundles are not in specific position

In monocots vascular bundles are of closed types, what does it denote ? (a) Xylem is surrounded by phloem (b) Cambium is absent in vascular bundle (c) The pores of vessel elements and sieve elements are closed (d) No connection in between two successive internodes.

(a.) In the young dicot stem, cambium present in patches as a single layer between xylem and phloem. (b.) Vascular and cork cambium both are form the lateral meristem. (C.) The medullary cells are derived from the interfascicluar cambium. In given statements, which of the following are correct ?

Read the following statements. A. All tissue on the inner side of the endodermis constitute the stele. B. Peripheral vascular bundles are generally larger than the centrally located ones in monocot stems. C. In late wood, cambium produces a large number of xylary elements having vessels with wider cavities. D. The cork is impervious to water due to suberin deposition in the cell membrane. How many of the above statements are incorrect?

Read the following statements about dicot stem and choose the correct option (a) Vascular bundles are arranged in a ring (b) Vascular bundles are conjoint, collateral and open type(C) Endarch type of arrangement of secondary xylem

Consider the following statement (A) In a dicot root, the vascular bundles are collateral and endarch (B) The inner most layer of cortex in a dicot root is endodermis (C) In a dicot root, the phloem masses are separated from the xylem by parenchymatous cells that are known as the conjunctive tissue Of these statement given above

Select the incorrect statement from the following. (a) Rhizobium multiply and colonises the surroundings of roots and gets attached to epidermal and root hair cell. (b) Successful infection of the root hair causes it to curl . (c) The nodule establishes a direct Vascular connection with the host . (d) Infection thread carries the bacteria to xylem and phloem .

Complete the following by selecting the correct option for the blanks A , B and C from the options given below. The symbiotic association formed by fungi with roots of higher plants is known as .... A....it is mainly formed by members from the genus.... B..... The fungal symbiont in these associations is responsible for absorbing......C......from the soil and passing it to the plant. It also has many other benefits like resistance to root borne pathogens tolerance to salinity and droughts , etc......D..... Seeds cannot germinate and establish without the presence of ......A .....

Tissue found between xylem and phloem bundles of a root is (a) vascular parenchyma (b) parenchyma (c) conjunctive meristem (d) conjunctive parenchyma